13553439 has 4 divisors (see below), whose sum is σ = 18071256. Its totient is φ = 9035624.

The previous prime is 13553431. The next prime is 13553447. The reversal of 13553439 is 93435531.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13553431) and next prime (13553447).

It is a cyclic number.

It is not a de Polignac number, because 13553439 - 2³ = 13553431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13553431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258904 + ... + 2258909.

It is an arithmetic number, because the mean of its divisors is an integer number (4517814).

Almost surely, 2^13553439 is an apocalyptic number.

13553439 is a deficient number, since it is larger than the sum of its proper divisors (4517817).

13553439 is an equidigital number, since it uses as much as digits as its factorization.

13553439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517816.

The product of its digits is 24300, while the sum is 33.

The square root of 13553439 is about 3681.4995586038. The cubic root of 13553439 is about 238.4239260910.

The spelling of 13553439 in words is "thirteen million, five hundred fifty-three thousand, four hundred thirty-nine".